College unit (6)
I believe the answer is:
credit
'college unit' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for credit that I've seen before include "Praise; tick" , "gives you a good result in examination" , "If this is good, you can borrow money" , "Believe; good reputation" , "Honour or reliability - believe" .)